2 oz. Gin (or Cognac)
1/2 oz. simple syrup (or 1 tsp. very fine sugar)
1 oz. lemon juice
Champagne or sparkling wine
Combine gin, sugar, and lemon juice in a cocktail shaker with plenty of ice. Shake vigorously and strain into two iced Champagne flutes (or scotch glasses with crushed ice). Fill with Champagne or sparkling wine. Garnish with a lemon twist.
1. The "French 75" was invented by French-American WWI pilot Raoul Lufbery, who believed champagne cocktails required more kick, as in the kick of a French 75mm field gun. Mr. Lufbery's second claim to fame was having a pet lion named Whiskey.